Discusses the feasibility of utilizing continuous sources of of energy, particularly solar and wind energy. Outlines an energy plan for Denmark, which would supply all of Denmark's energy needs by the year 2050. (MLH)

Concern for long-term availability of nonrenewable resources has fostered proposals for substitution with renewable resources. Forest products could become the basis for materials substitution and production. Further feasibility studies are needed to determine the technical, economic, energy, and environmental aspects of substitution. (MR)

Argues that overexploitation of renewable biological resources to the point of extinction is possible under private (commercial) management. Public surveillance is necessary to prevent severe depletion of resources. An economic theory of a biological resource is developed, using the blue whale population as an example. (JR)

The water consumption requirements for a variety of energy options are presented, and comparative judgments drawn. Attention is focused on problems resulting from synthetic, gaseous, and liquid fuel production. Scenarios describing possible future levels of coal and electricity use are analyzed. They point to the importance of water supply…

The dynamics of growth have broadened concern over future materials supplies. The problem is multidimensional encompassing issues of depletion, materials cycles, recycling and substitution problems, energy, environmental costs, and economic growth. A new issue has also arisen demanding an international economic order between developed and…

Dwindling mineral resources might cause a shift from nonrenewable resources to renewable resources and inexhaustible elements such as iron and aluminum. Alternative energy sources such as breeder, fusion, solar, and geothermal power must be developed for production and recycling of materials. Substitution and, hence, living standards ultimately…

Summarizes the criticisms of the Office of Science and Technology (OSTP) review committee. Emphasizes research deficiencies in most of the major energy programs. (MA)